Quote:
Originally Posted by vts1134
I was wondering if any one had any ideas about the problem in the video below. I have not yet performed the horizontal alignment procedure on this set. I'm not sure if that would account for the drifting horizontal or not.
http://www.youtube.com/watch?v=WGW0VQr36vA |
VTS,
You are in no way ready to start a horizontal alignment on this set until you fix this problem.
You are seeing 60 cycle hum in the picture that is mostly effecting the horizontal sweep.
It maybe in the power, sync, or video sections, or in most any place in the system. If the hum also comes from the speaker, that might be a clue pointing towards the power supply.
If you have not replaced the electrolytics, they are is the most logical suspects, especially in the power supply. (If you suspect a bad electrolytic -- ie, open, not shorted -- jump it with another for test. If it improves the picture that is either part of or the problem.)
I would check all the tubes for heater cathode shorts, as that is also a very likely spot. All tubes should have been checked for shorts prior to the first power up.
A oscilloscope might be a help in narrowing the problem, especially if it is from a wiring error made while recapping.
Also, another possibility is this is that you are picking up a hum between the ground of the B&K and the set you are testing. If your tuner is working, feed the set by hanging 3 foot wire on the RF output of the B&K and picking up the signal "over the air".
Just in case this problem is originating with the B&W analyser, have you tested the set with another analog signal source?
By the way, what is this set? I can see that is an early small roundie, but can't see enough in the video to recognize it.
James.